摘要:
This invention relates to thermoplastically deformable branched aliphatic polyamides prepared by the hydrolytic polycondensation of lactams in the presence of small quantities of .alpha.-amino-.epsilon.-caprolactam (ACL) and approximately equivalent quantities of polycarboxylic acids (preferably dicarboxylic acids) and to a process for their preparation which is distinguished by considerably reduced polycondensation times without giving rise to cross-linked products. The process optionally in addition employs a solid phase after-condensation in which rapid further condensation takes place to the products with increased melt viscosity which are branched but are still soluble in m-cresol.
摘要:
The present invention relates to a process for the preparation of aromatic polycarbonates, aromatic polyester carbonates and aromatic polyesters by the known two phase interface process, which is characterized in that the organic phase used is a mixture of aromatic hydrocarbons with alkanes and/or cycloalkanes.
摘要:
In a therapeutic system such as a plaster for administration of an active compound through the skin and comprising a covering layer which is essentially impermeable to the active compound, an active compound reservoir layer and a protective layer which can be pulled off and which is essentially impermeable to the active compound, the improvement wherein the reservoir layer contain about 1-30% of active compound in an elastomer mixture comprising a predominantly amorphous olefinic (co)polymer with a glass transition temperature of
摘要:
Thermoplastical processible polyamides are rendered hydrophobic by addition of particular aromatic amines, optionally in combination with selected phenolic compounds.
摘要:
Transparent copolyamides obtained by polycondensing a lactam or a corresponding amino acid, an aliphatic and/or aromatic dicarboxylic acid and a mixture of hydrogenated condensation products of aniline and formaldehyde.
摘要:
Transparent copolyamides obtained by polycondensation of mixtures of positional isomeric diaminodicyclohexyl methanes and optionally further diamines and azelaic acid and optionally isophthalic and/or adipic acid. The copolyamides are valuable moulding compounds for the manufacture of various products such as sheets, films, plates, tubes, rods and containers.
摘要:
A process for the activated anionic polymerization of lactams wherein as activator a fluid partially masked aliphatic araliphatic or cycloaliphatic polyisocyanate being masked with 0.5-0.7 equivalents of lactam per equivalent of NCO groups is used.
摘要:
Polyamide moulding materials which have been impact-modified with diene and/or acrylic rubbers and can be processed by thermoplastic means and contain special diphenols.
摘要:
The invention relates to a process for the production of aromatic polycarbonates, aromatic polyester carbonates and aromatic polyesters by the known two-phase interfacial method which is characterized in that a mixture of aromatic hydrocarbons with alkanes and/or cycloalkanes is used as the organic phase and in that phosphines or phosphine oxides are used as the catalysts.